I used following ./configure (to build Xephyr) and compile failed for me...
./configure '--enable-ipv6' '--disable-composite' '--disable-shm'
'--disable-xres' '--disable-xtrap' '--disable-record' '--disable-xv'
'--disable-dga' '--disable-screensaver' '--disable-xdmcp' '--disable-xdm-auth-1'
'--disable-glx' '--disable-aiglx' '--disable-dri' '--disable-xinerama'
'--disable-xf86vidmode' '--disable-xf86misc' '--disable-xcsecurity'
'--disable-xevie' '--disable-lbx' '--disable-appgroup' '--disable-cup'
'--disable-evi' '--disable-dbe' '--disable-xf86bigfont' '--disable-dpms'
'--disable-xinput' '--disable-xorg' '--disable-dmx' '--disable-xvfb'
'--disable-xnest' '--disable-xwin' '--disable-xprint' '--disable-xgl'
'--disable-xglx' '--disable-xegl' '--enable-kdrive' '--enable-xephyr'
'--disable-xorgcfg' '--disable-kdb_mode' '--prefix=/home/amd/opt'

Making all in xfixes
make[1]: Entering directory `/home/amd/code/xserver/xorg/xfixes'
if /bin/sh ../libtool --tag=CC --mode=compile gcc -DHAVE_CONFIG_H -I. -I.
-I../include -I../include -I../include -I../include -I../include -I../include
-I../include -I../include    -DHAVE_DIX_CONFIG_H   -D_BSD_SOURCE -DHAS_FCHOWN
-DHAS_STICKY_DIR_BIT   -I../include -I../include -I../Xext  -I../damageext
-I../xfixes  -I../mi -I../miext/shadow  -I../miext/damage -I../render -I../randr
-I../fb  -g -O2 -MT cursor.lo -MD -MP -MF ".deps/cursor.Tpo" -c -o cursor.lo
cursor.c; \
then mv -f ".deps/cursor.Tpo" ".deps/cursor.Plo"; else rm -f ".deps/cursor.Tpo";
exit 1; fi
 gcc -DHAVE_CONFIG_H -I. -I. -I../include -I../include -I../include -I../include
-I../include -I../include -I../include -I../include -DHAVE_DIX_CONFIG_H
-D_BSD_SOURCE -DHAS_FCHOWN -DHAS_STICKY_DIR_BIT -I../include -I../include
-I../Xext -I../damageext -I../xfixes -I../mi -I../miext/shadow -I../miext/damage
-I../render -I../randr -I../fb -g -O2 -MT cursor.lo -MD -MP -MF .deps/cursor.Tpo
-c cursor.c  -fPIC -DPIC -o .libs/cursor.o
cursor.c: In function 'ProcXFixesHideCursor':
cursor.c:840: error: expected '=', ',', ';', 'asm' or '__attribute__' before '*'
token
cursor.c:840: error: 'stuff' undeclared (first use in this function)
cursor.c:840: error: (Each undeclared identifier is reported only once
cursor.c:840: error: for each function it appears in.)
cursor.c:840: error: 'xXFixesHideCursorReq' undeclared (first use in this function)
cursor.c:840: error: expected ';' before 'client'
cursor.c: In function 'SProcXFixesHideCursor':
cursor.c:879: error: expected '=', ',', ';', 'asm' or '__attribute__' before '*'
token
cursor.c:879: error: 'stuff' undeclared (first use in this function)
cursor.c:879: error: 'xXFixesHideCursorReq' undeclared (first use in this function)
cursor.c:879: error: expected ';' before 'client'
cursor.c: In function 'ProcXFixesShowCursor':
cursor.c:892: error: expected '=', ',', ';', 'asm' or '__attribute__' before '*'
token
cursor.c:892: error: 'stuff' undeclared (first use in this function)
cursor.c:892: error: 'xXFixesShowCursorReq' undeclared (first use in this function)
cursor.c:892: error: expected ';' before 'client'
cursor.c: In function 'SProcXFixesShowCursor':
cursor.c:923: error: expected '=', ',', ';', 'asm' or '__attribute__' before '*'
token
cursor.c:923: error: 'stuff' undeclared (first use in this function)
cursor.c:923: error: 'xXFixesShowCursorReq' undeclared (first use in this function)
cursor.c:923: error: expected ';' before 'client'
make[1]: *** [cursor.lo] Error 1
make[1]: Leaving directory `/home/amd/code/xserver/xorg/xfixes'
make: *** [all-recursive] Error 1